Dynamo-electric machine.



A. H. NEULAND.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED MAR. 30. 1915.

Patented Apr. 17, 1917.

29mm; Sumo a fla/M 1 Quota W M @Q;

ALFONS H. NEULAND, OF NEW YORK, N. Y.

DYNAMO-ELEGTBIC macnnin.

Specification of Letters Patent.

Patented Apr. 17, 1917.

Original application filed January 19, 1914, Serial No. 812,908. 7 Divided and this application filed March' 30, 1915. Serial No. 18,009.

To all whom it may concern:

Be it known that I, ALFONS H. NEULAND, a subject of the Czar of Russia, residing at New York city, in the borough of Manhattan and State of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a full, clear, and exact description.

My invention relates to dynamo-electric machines, and particularly to such machines of the type shown in my co-pending application, Serial Number 812,908, filed January 19, 1914, of which this is a division. In my said original applicationv a generator isdisclosed in which a current is generated in a coil through the shifting of the generating flux alternately from one part to the other of two-part pole pieces by a rotating toothed inductor which cooperates with teeth on the pole pieces.

An object of my present invention is to provide simple and convenient means for properly spacing and rigidly supporting the field parts of-such a machine. Another object is to so support the parts as to prevent the generation by the shifting or varying flux of currents in the closed circuits formed partly by the supporting members, which would choke back the flux. -Other objects are convenience in assembling the parts, simplicity and compactness of construction, and reliability, in operation. Still other objects and advantages of my invention will appear from the following description.

In accordance with my invention the supporting members, which form parts of closed circuits, are so arranged relative to the magnets and pole-parts that the "flux through each closed circuit is constant, whereby the supports do not interfere with the shifting flux. Preferably the pole pieces are supported at their ends and at a point midway of their ends, their middle support also serving to support themagnets. The middle support is preferably a rib integral with the frame or casing, which also serves to space the magnet sections, and the end supports may be lugs or arms also integral with the casing and each lug serving as a common support for two adjacent pole pieces, though bolts or other suitable devices attached to Tvly invention also includes var-ions other features of construction, arrangements and combinations of parts, as will hereinafter more fully appear.

I shall now describe the embodiment of my invention illustrated in the accompanying drawings and shall thereafter point out my invention in claims.

. Figure l is a central axial section of a generator embodying my invention; and

Fig. 2 is a transverse section of the same.

The illustrated magneto has a suitable cylindrical frame or casing 1 of non-magnetic material such as aluminum, closed on.

one face by an integral wall 1, and a removable wall 1 being provided for the other face. The cylindrical wall is provided on diametrically opposed sides with a plurality of internal longitudinal ribs, shown as two, and -marked, respectively, 20 and 21, and there is also a corresponding number of outstanding lugs or arms 22 and 23 extending parallel with the axis of the casing and integral with the wall 1 and spaced somewhat from the inner periphery of the cylindrical wall of the casing. The permanent magnet is composed of .a corresponding number of arcuate parts or sections 2 and 2 fitting within the casing and spaced by the ribs 20 and 21, the magnet sections being laminated. These magnet sections 2 and 2 are arranged with their north poles and south poles adjacent, forming in the construction shown one permanent north pole and one permanent south pole, as indicated by the letters N and S. These poles are provided with laminated pole pieces of general arcuate shape Which are non-integral or separate members and, arranged internally of the magnets, their two ends abutting against the lugs or arms 22 and 23, and their centers contacting against the respective ribs 21 and 22 and adjacent ends of the magnet sections. In. the form shown, the arms or lugs 22 and 23 are of general T-shape in. cross section and have their heads extending oppositely over the adjacent ends of the pole pieces. The

laminated magnets and pole pieces are thus rigidly supported and locked in the frame and securely held in place against lateral or circumferential displacement.

I The pole pieces are provided with central coil-receiving slots 3 and 3, respectively, and the halves or sections on opposite sides of these slots form pole-parts or divisions 3. W, N and A. respectively, the micparts S and N being on one side of the coil 5, and the pole-parts N and S being on the opposite side of the coil. The induced 0011 5 is arranged within the slots 3 ,and 3, and extends between the poles longitudinally of the casing and surrounding the inductor.

' The inner faces of the pole-parts are arranged in a circle and are provided with similar teeth 6 6 7 and 7", respectively, arranged parallel to each other and to the axis of the casing. The teeth on each section are of the same pitch and the two adj acent teeth on the opposite sides of each of the slots 3 and 3 are so spaced apart that the teeth on one pole-part are offset from the teeth on the other pole-part of the same polalrlity a distance equal to one-half a tooth itc Mounted axially in the casing and rotatable between the pole pieces'is an inductor "8 formed of a plurality of annular laminated plates, preferably of steel, mounted upon a'drum 9 which has a hub portion fixed on the shaft 10 of the inductor which is driven by the engine shaft 10 'in any usual, or suitable way, as by gearing, as shown.

The shaftlO bears in the sleeve 11 which is secured within an inwardly-projecting hub 12 integral with the front of the casing,-

' The inductor is provided with teeth 8 similar and parallel to those on the pole pieces, and of a similar pitch, the. diameter of theinductor being such that the ends of its teeth rotate in close proximity to the inner ends of the teeth on the pole pieces. Due to the-'ofisetting of the teeth onone pole-part of ,for one-half a tooth'pitch causes its teeth to aline with those on pole-parts 6 and7 and it is evident that the teeth of the inductor are staggered in these respective positions with the teeth with which they are not alined. Since the magnetic flux will assurne the path of least reluctance, it is evident that the flux is therefore reversed through the coil for each angular movement of the inductor for a distance of one tooth pitch, and that'for each complete rotation of the inductbrtwice as'many impulses are produced in the coil as there are teeth on the lnductor; in this way a current of suffiv ciently high frequency forli hting purposes, is generated at low speeds o the inductor.

- It will benotedthat the supports are arranged so that wherever they form part of several closed circuits, the .flux through such circuits is constant; .for instance the flux is constant through the electric circuit formed by the middle support, one of the end supports and the laminations, since the middle support is so locatedthat the flux in shifting from one pole-part to the other takes its path through the section of the pole piece between the coil-receiving slot'and the middle support, and the flux through the circuit formed by the two end supports and the laminations is also constant, being equal to the flux produced by all the magnets. Rotation of the inductor does not cause the flux to vary through this circuit but only changes the position ofthe flux with respect thereto.

The supporting means for the magnet sections and pole pieces are extremely simple scribed within the principle and scope of my invention.

I claim 1. In a dynamo electric machine, means for producing a magnetic flux, a plurality of toothed two-part pole pieces, one for each pole of the field, a toothed rotative inductor cooperative with the teeth on ,the pole pieces to alternately shift the flux from one pole-part to the other of the respective pole pieces and for each pole piece supporting members so arranged that the fiux passing between the supporting members rema', s constant, whereby the flux is permitted to shift from one out interference, I

2. In a dynamo-electric machine, means for producing a magnetic flux, a plurality of toothed pole pieces, one for each pole of the field and each pole piece being provided .with a coil-receiving slot dividing the pole piece into two pole-parts, a toothed rotative inductor cooperative with theteeth on the pole pieces to alternately shift the flux from one pole-part to the other of the respective pole-part to the other withpole pieces, and a supporting member for each pole piece engaging the pole piece at a point adjacent to the coil-receiving slot and on the side opposite the inductor. i

3. In a dynamo-electric machine, means for .producin a magnetic flux, a plurality of toothed po e pieces, one for each pole of the field and each pole piece being provided with a coil-receiving slot dividing the pole piece-into two pole-parts; a toothed rotative inductor cooperative with the teeth on the pole pieces .to alternately shift the flux from one pole-part to the other of the respective pole pieces, and supporting and spacing means for each of the pole pieces comprising two end supports and a middle sup ort, the middle support engaging the polepiece at a. point adjacent the coll-receiving slot and on pole-part to the other of the respective pole pleces, an induced winding axially surrounding the inductor, and supporting means for the pole pieces arranged to permit the flux to shift from one pole part to the other without interference. y

5. In a dynamo-electric machine, in combination with the frame, a plurality of circumferentially arranged magnets, a plural ity of toothed two-part pole pieces, one for each pole of the field, a toothed rotative inductor cooperative with the teeth on the pole pieces to alternately shift the flux from one pole-part to the other of the respective pole pieces, and a plurality of ma et s 8,011! members carried by the frame a iiid aii 'angeg between theadjacent ends of the respective magnets and each member engaging and supporting the respective pole iece.

6. Ina dynamo-electric mac ine, in combination with the frame, a plurality of circumferentiall arranged magnets, a plurality of toothe pole pieces, one for each pole of the field and each pole piece being provided with a coil-receiving slot dividing the pole piece into two pole-parts, a toothed rotative :inductor cooperative with the teeth on the pole piece to alternately shift the flux from one'pole-part to the other of the respective pole pieces, a plurality of magnet spacing members carried by the frame and arranged between the adjacent ends of the respective magnets and each member engaging the respective pole piece adjacent, the coil-receiving slot-and on the side opposite the inductor and supporting the-pole piece at this point, and a corresponding number of end supporting members for the pole pieces carried by the frame and each end supporting member engaging and-supporting the two adjacent ends of two adjacent pole pieces, whereby the supports permit the.

fiux'to shift from one pole-part to the other without interference.

7 In a magneto generator, a frame of non-magnetic material provided with a plu-' rality'of magnet-spacing ribs on its inner periphery and a corresponding number of.

outstanding lugs or arms spaced from the periphery and substantially'parallel with the axis of the casing, magnet sections fitting within the casing and extending between and spaced by the ribs and arranged with the adjacent ends of the successive magnet sections of the same polarity, toothed two-part pole pieces having their ends bearing against and supported by two consecutive outstand ing lugs or arms andsupported midway of their ends by the intervening ribs, one pole piecemaking magnetic contact with the two adjacent ends of the two magnet sections, and a toothed rotative inductor cooperative with the teeth on the pole pieces to alternately shift the flux from one pole-part to "the other of the respective ole pieces.

- In witness whereof, I su scribe my signature, in .the presence of two witnesses;

' ALFONS H. NEULAND. Witnesses:

WALDO M'. CHAPIN,

JosEP A; BUoKLnY- 

